Hello feurigel, thanx for your prompt reaction. I've installed Atomic Tanks and handsoff.
Both were in no category.
Meanwhile i purged catorise plus - but I had to delete the catorise folder in opt manually. Afterwards I reinstalled catoriseplus and for the moment the problem is solved and i don't know if the problem will appear again.
Maybe it was because i've renamed every given category?
If it happens again i will tell you.